Abstract
One early challenge in life is to learn how to communicate, a skill that is not limited to the animal kingdom. Microorganisms communicate through cell-to-cell chemical signaling, called quorum sensing (QS), that was recognized as early as 1970 by J. Woodland Hastings and his collaborators at the Marine Biological Laboratory in Woods Hole, Mass. They reported that Vibrio fischeri, a bioluminescent bacterium, produces an extracellular molecule, later identified as acyl-homoserine lactone (AHL), that activates light production when these cells reach a particular population density. The bioluminescent Vibrio fischeri emits light in response to AHLs within their own species when colonizing the light organs of squid or fishes, where these bacteria colonize as a homogeneous community.
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